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Pulse amplitude modulating method and circuit for improving D class audio amplifier property

A pulse amplitude modulation, audio amplifier technology, used in pulse amplitude modulation, low frequency amplifiers, improving amplifiers to reduce nonlinear distortion, etc., can solve problems such as increasing total harmonic distortion and damaging sound quality

Inactive Publication Date: 2006-06-07
PRINCETON TECHNOLOGY
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AI Technical Summary

Problems solved by technology

The actual output of this distortion increases the Total Harmonic Distortion (THD), thereby compromising the sound quality

Method used

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  • Pulse amplitude modulating method and circuit for improving D class audio amplifier property
  • Pulse amplitude modulating method and circuit for improving D class audio amplifier property
  • Pulse amplitude modulating method and circuit for improving D class audio amplifier property

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Embodiment Construction

[0022] Please refer to Figure five , shows the circuit block diagram of the present invention, and this figure uses TA+ and TA- as an example, but TB+ and TB- are also applicable.

[0023] Figure five On the right is a traditional Class D audio amplifier circuit. In this embodiment, a resistor 14 is connected in series with the speaker 8 between points A and B. Figure five The circuit block diagram of the present invention is shown on the left, which is divided into upper and lower parts by dotted lines. The upper part is the voltage adjustment circuit, and the lower part is the voltage compensation circuit.

[0024] The voltage regulation circuit includes a “redundant” area detection pulse generator 51 , an integrator 52 and a voltage regulator 53 . The voltage compensation circuit includes a "lost" area detection pulse generator 54, an integrator 55, a voltage regulator 57, and a judgment circuit 56 for judging the polarity of the current. TA+ and TA- are respectivel...

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PUM

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Abstract

This inventio0n provides a reform method and a circuit for PAM of D kind audio amplifier and the input of the amplifier is a signal of PWM having the delay design of deadtime, in which, the method includes: testing the polarity of the output current of said amplifier, when the current is negative, a voltage regulation circuit is added onto the supply of the amplifier to control the supply voltage to drop from the high to low potential in deadtime, when the current is positive, a voltage compensation circuit is added to the N point to compensate the voltage of that point to let it rise to the high potential from the low in deadtime.

Description

technical field [0001] The invention relates to a pulse amplitude modulation method and a circuit for improving the performance of a class D audio amplifier, in particular to a method and a circuit capable of reducing and avoiding defects caused by ineffective time design in a class D audio amplifier. Background technique [0002] refer to Figure 1 , is a schematic diagram of a traditional Class D audio amplifier. PWM (pulse width modulation) signal V PWM NMOS1 (N-type metal oxide semiconductor) and NMOS2 located on the left side of the class D audio amplifier, and NMOS3 and NMOS4 located on the right side of the class D audio amplifier are input from the left. Inverters 5, 6, and 7 are arranged in the path, as shown in the figure. Signals input to the gates of PMOS1, NMOS2, NMOS3, and NMOS4 are represented by TA+, TA-, TB+, and TB-. The junction A between NMOS1 and NMOS2 and the junction B between NMOS3 and NMOS4 are the output terminals, and the speaker 8 (expressed by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K7/02H03F1/32H03F3/181
Inventor 马独先
Owner PRINCETON TECHNOLOGY
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